Tire-mold.



I a J a '1 7 ATTORNEY D. c. ROBERTS.

TIRE MOLD.

APPLICATION men JUNE 19. I915.

1,233,81 0. Patented July 17, 1917.

'UNITED STATES PATENT OFFICE.

UANIEL C. ROBERTS, OF TBENTONT, NEW JERSEY.

TIRE-MOLD.

Application filed June 19, 1916.

ings.

Theprineipal object of the invention is to provide a mold wherein the trend of the tire maybe built-up and shaped inde wmlent ot' the side portions, thus enabling the operator to turn out anynumber of trends irrespective of the other parts of the tire; it being contemplated that the wear upon the tread, during usage; will cause the same to deteriorate and become worn much more quickly than the side portions of the tire.

The invention further aims to provide a mold of novel construction wherein the several relative parts may he readily associated unit during the molding opera in a single conversely, quickly withdrawn tion an "from about the article molded either before or after the vulcanization of the latter.

Another object is to provide a mold of the above character which is susceptible of an aa'ial pressure to not only aid in the formation of the article to he molded prior to the vulcan'izing step but. to firmly retain the Several. parts of the mold in a secure position and preclude relative movement thereof.

Various other objects and :nlvantages will become. apparent during the continuance of the following description.

Specification of Letters Patent.

, Patented July 1'7. 1917.

Serial No. 104,529.

therewith means to clamp the several parts in a secure position,

Fig. 2 its a view similar to Fig. 1, of the side section mold,

Fig. 3 is a view in section taken on line 325 of Fig. 1 showing means to fasten certain sections of the mold together,

Fig. 4 is a view in section of a slightly modified form of tread mold. v

In the present embodiment the matrix of the preferred tread mold consists of opposed circumferential sections 1.0 and 11 which have-their opposite faces cut away as indicated at 12 to form a mold cavity or chamber, Upon their inner perlphery' sections 1.0 and 11 are provided with suitable recesses 13 while just inwardly of the 1 recesses are located oppositely aimed mwardly directed ribs 14- as clearly shown in Fig. 1. 'lhe'seetions are further provided upon their outer peripheq with opposite circumferential grooves 15 which, when the Sections are in assembled relation receive a securing ring lfiwhieh holds them in axial alinement while the section 17 is removedfor allowing the-tire forming material to be placed in the mold.

()n the. other hand, a, core or inner mold section 17 extends into the mold cavity 12 and has flanges 18 fitting the recesses 13 of the sections 10 and 11. Core 17 is also provided with circumferential grooves 19 oposite the curved surfaces of the ribs. 14

ill lllt HUOtlOIiR.

'lhe mold (Ta'l'ity, which is formed upon the assembly of the several parts of the device. is perceptibly arcuate when viewed in cross-section. as it appears in Fig. 1. its a-riplu-ral edges substantially cylindrical. Consequently the tread. wllen formed, will not only be arcuate when viewed in cross- Slt'lltlll but it will have enlarged ribs at its peripheral edges such as will enable it to he o wratively associated with the side seetions of the tire. I

Au axial pressure, such as may be exerted through the instrumentality of the clamp designated in its entirety by the numeral 20, not only serves to brin the sections 10 and 11 into a properly almed position, but it also serves to retain all of the parts of the mold in a Hernl'e position during the molding operation, lloth the ring 16 and the flanges ]H of the core 1? limit the inward 5 movement of tlmser-tir'ms and 11 against 10 rler ordinary eirelmieitances.

1n the reduction of the invention to rue-,- tiee I l'ltH'OffOlll'lt'llt tldvlFallll. to make the core or inner mold elementl? in sections,

under-certain circumstances such as clearly- 15 shown in Fig. 3.

In this event the ends of the respective sections of the core are beveled as at 21 to lie in overlapping relatlon {see Fig. 3), while means sneh as shown a tj.

may be employed to retainthe sections against relative movement. Because of this arrangement, the inner moldfscetion may be collapsed or dismembered when seating 01' nnsea tingv said inner core me1n er.,

. In that for n'of ti ead 'moldjshown Fig 1 it will befiniticed: that;tl idopposed edges -0ff'the sectionn' lid-and f'llladjacent thcir' outer periphery taper tof a feather edge to form a continnoiis surfaccfopposed t0 the inneifi' lace of the co're" 17 thus rei|dering :ie the tread vhen 'rnoldedcomparatively. gaiamth upon' t$ oi1tei"-face.j However in.

that form ahoe 'n in Figlii l ithese edges lie nhlcdielutidnhould'er.

511 n d; forniop in forms a wall of the melt wit) and the ftr -ad' \iill heim'ana "with'a" circ'umferen tial rib upon. ts 'treadwn ea at a point ap 1d proximately it|i nl- .vay .1t longitudinal edges,

in pas-q mg} 1 o\\"'.'.i to the side section imold' shown in Fig". 2, the, matrix '15 preferably in r the. form of a amtar y annularbody 24-, cut

o t upon one ideto reeeivethecol-e25; a

1;; mold (Emily 16 being formed between the inner wall of the out out of the body 24 and" he inner wall of tl 1e ure 25.

posed Walls are to be 'peenliarly fil$lii0l'l(!(1,' aeeordmg to the. en-enl'nstanees :of .the case! when-by ll ti\'e| name alumrel'erriwl to. 1n,-lho" pre'sent embodiwill. the wallsare so formed whereby the mold madly... l

slightly ahot'e:llleiarelulle portions ol lhe' nioldeavily the limb" ia proridlal with 11' eirenml'erenlml rih it; \Yllllt'. the, rore is pro (50. \ided at. an opposite point with IthllitllfHV vsired, be used to prepcrly i etainiath coreky From the-foregoing it is believed-that he" tion will be "readily fore further details iii sparedrelition"Whenjhe' sections 10 and v "to be. secureil' -by d i p, .23.: ,(lonsemiently, in this part|cnlan form, the nner face of the ring l ri phery and' anannnlar-sh rounding ;er') rrespoiuli| eompleniehtary med-m "co-axial relation; anda j il "between. said annular "r'ih,

annu-l'arshoul'deifs of .aid-

1 may be. operatread member 1 .fonter p eri heries and h'lmlmd' m diate its longlliiyhnal ed q-s. and enlarged tion of the side section will taper to a feather edge. llelow' the arcuate portion ol the mold cavity hod "l-l: is provided with an annular groove 25 while the. opposite'portion of the core is eul away as at 29 so as i to properly shape the shoe elf-the side 5913- tion. It will also he noticmhthat the'lower wall of theinold cavity extends .atright angles to the outer fare of the body 24 and the c'ore -25"and also in parallelism to the inner and-enter perijihery of the body-24=i '75 v A clamp such 'as shown at 30 m'ajgiif der' within. the cavity of the body-24;?

advantages and novel fci'itnre's p'fm' n Yn imderfitootl n theredeemed unnecessary.

In' reducing'theim' will be found tliatl'i tlie f entibn l;' A :tread iinol complementaryvainujla mg an annular shonlt periphery and an-f annnla the last. said annular hetween lfhe lirat staid 3| 51's to hohl'sanl ('rompleln' mg a molding snrfaee mm of said 'mold' elemejat' i peripheries H as to [H'tfllllt molding sm-l'aee, a' ring; sureml'ndmg atoll eomplennenlaev sections a't'lhei, l l l'tl lltg iine so as lo'hold them in(to-axialfl'i-latldj alnl a mold element lHIYiHL 'Z I"ll'll l ld lllg su' rat-.- exlending' between said-annularjriha l xaid pair of mold xeutiHIlS-i, said mold-felts m n! la-lngnorniall seal-ed againsl; said annular I'll; and helaveelb Said anmll illf 3. A tread {noid comprising a pair of complementary annular sections each having an annular shoulder at its outer pe riphery, an annular shoulder at its inner periphery, a ring normally surrounding portions of said mold sections and seate between. the first said annular shoulders thereof, and a collapsible mold element having a molding surface extending between said annular sections and seated between the 1 annular shoulders of the inner peripheries of said annular sections.

In testimony whereof I aflix my signature in presence of two witnesses. DANIEL C. ROBERTS.

Witnesses M. E. Jones,

Jusem W. Home; 

